Engineering plant thioesterases and disclosure of plant thioesterases having novel substrate specificity
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United States of America Patent
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Nov 21, 2000
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Jun 3, 1997
filing date -
May 15, 1995
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Abstract
Methods of altering substrate specificity of plant acyl-ACP thioesterases, and engineered plant acyl-ACP thioesterases so produced are provided. The C-terminal two thirds portion of plant thioesterases is identified as desirable for such modifications. DNA sequences and constructs for expression of engineered thioesterases, as well as the novel thioesterases produced therefrom are also provided. Such DNA sequences may be used for expression of the engineered thioesterases in host cells, particularly seed cells of oilseed crop plants, for the modification of fatty acid composition. Of particular interest is a mangosteen Garm FatA1 18:1 thioesterase in which the relative 18:0 activity has been increased. Such FatA thioesterases find use for improved production of stearate in vegetable seed oils.
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